Stem-winding watch.



PATENTED JUNE'23, 1903.

E. KOEHN. STEM WIN DING WATCH.

APPLICATION FILED OCT. 18, 1902. v

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No. 731,789. PATENTED JUNE 23, 1903. E. KOEHN.

STEM WINDING WATCH.

nrmouxon rum) 00T.18, 1902. no MODEL. ZSHEBTS-SHEET 2 Patented June 23,1903.

PATENT ()FFic EDOUARD, KOEHN, on GENEVA, SWITZERLAND.

STEM-WINDING WATCH.

SPECIFICATION forming part of Letters Patent No. 731,789, dated June 23,1903.

Application filed October 18, 1902- Serial No. 127,773. (No model.)

To all whom it may concern:

Be it known that I, EDOUARD KOEHN, manufacturer, of Geneva, Switzerland,have invented certain new and useful Improvements in Vatches, of whichthe following is a specification.

My invention consists in certain improvements in and relating towatches, and especiallyto the so-called extra flat watches and theinvention refers, on the one hand, to a peculiar arrangement of themovers intended to combine a very strong mainspring and spring-barrelwith such an extra flat watch notwithstanding the small space which isavailable in such watches, and, on the other hand, to provide a newwinding-up device for such mainspring and a handsetting mechanism bothacted upon by the stem of the eXtra fiat watch.

The present invention consists in the said improvements without reducingin any way the normal height of the escapement and in a manner whichallows the balance-wheel to project above the other parts of the watch.

In the drawings, Figure 1 is a plan view of those portions of the watchwhich are in cluded in the invention and which are located under thedial. Fig. 2 is a similar plan view of the opposite face of thewatch-movement.

Fig. 3 is a partial plan of the movement,

showing the parts in a different position than Fig. 2 and after thewithdrawal of the mainspring-barrel and first or center wheel. Fig.

4 is a side elevation of the rocking lever b.

Fig. 5 illustrates separately and on an e11- larged scalethesetting-screw Z. Fig. 6 is a plan view similar to Fig. 1, showing amodified construction of the rocking lever Z. Fig. 7 is a plan viewsimilar to Fig. 2, showing the said modification. Fig. 8 is across-section on the line A B O D of Fig. 6.

In Figs. 1 to 5, a is the watch-plate, on which is pivotally connectedarocking bridge Z), Fig. 2, by means of a pivot-screw c, which, passesthrough the said plate a and is screwed to a disk (Z, placed on theopposite face of the plate, Fig. 1. The disk cZ acts as a pivot for thegear-wheel e, which meshes with the usual stem-pinionf. A spring q isprovided, which tends to maintain the rocking bridge 1) into its normalposition. (Shown in Fig. 2.)

The rocking bridge Z) has a projection 1),

Figs. 3 and 4, which passes through an opening a in the plate a andwhich carries a pinion g, continuously in gear with the wheel 8 andwhich may be put into gear with the minute-wheel h when the parts arethrown into their positions shown in Fig. 3that is to say, when the stem70 is moved in the direction shown by an arrow in the said Fig. 3. Z isthe hand-setting lever, one end of which engages the circumferentialgroove 7t of the stem 70, and the other arm of which engages one of thenotches of the arm Z) of the rocking bridge 1).

In order that the stem It may be easily removed when the movement is tobe taken out of the casing, the pivot-screw i of the lever dis providedwith a head having a doubleconical recess, 'as shown in Fig. 5, and thehole in the said lever i is diagonal or made with inclined walls, asshown in the said figure, the plate a being, moreover, provided with asuitable recess allowing the lower conical portion of the said head ofscrew ito descend into the said recess when the screw 1" is screweddown. When this takes place, the leveriis automatically displaced by theupper conical portion of the screw-head in the direction as shown by thearrow 2, and when the screw 1" is unscrewed, and therefore the lowerconical portion of its head raised, it will cause the lever Z to bedisplaced in the directionas shown by the arrow Z. In the first instancethe end of said lever 2' will be caused to engage the groove Zc, and inthe second instance it will be removed therefrom. The arm b of therocking bridge I) is beveled and bears against a pin Z, which passesthrough an opening a in the plate and is fixed to a disk Z, Fig. 1,pivoted at Z to the plate. To. the disk Z is pivotally connected apinion m, which gears when in the position shown in Figs. 1 and 2 bothwith the wheel 6 and with the wheel n. \Vhen the disk Z is rotated, bymeans of the displacement of the pin Z, from the position of Fig. 2 tothe one of Fig. 3, the'pinion m is disengaged from the wheel 71, butremains in gear which passes through an aperture a of the plate, Fig. 2,and which is to be acted upon by hand when it is desired to put the pawlout of action. If one presses the stem is inwardly in the directionshown by an arrow in Fig. 1, the lever z' is rocked into the position Iin which it allows the rocking bridge I) to be placed by the action ofthe spring q into the position shown in Fig. 1, and the spring 0 thenkeeps the pinion m in gear with the barrel-wheel at.

If one pulls the stem outwardly in the direction of the arrow shown inFig. 3, the lever icauses the arm b of the rocking bridge I) to berocked from the position of Fig. 2 to the position of Fig. 3, and thearm b then displaces the pin P, so as to disengage the pinion m from thewheel n.

In the modification shown in Figs. 6 and 7 the above-described disk Z isreplaced by a rocking lever Z pivotally connected to the plate a at Zand guided by means of a fixed screw Z which passes through a suitableslot in the said lever Z The latter carries a pin I, acted upon by thespring 0 in the opposite direction to that in which the spring 0 actsupon the disk Z, as shown in Fig 1. The

lever Z is provided with a pin Z passing through a suitable hole in theplate a on the opposite face of the watch and engaging therewith arocker r, pivoted to the plate at r and acting upon the rocking bridgeI), which is provided in this construction with a suitable recess forthe said rocker r. This device works exactly in the same manner as theone shown in Figs. 1 to 5 and hereinbefore described.

Fig. 8 is a cross-section on the line A B C D i of Fig. 6 and shows thearrangement of the mainspring-barrel with regard to the plate a and tothe winding-up device.

The mainspring-barrel s is of usual con struction, and its shaft 25 hasa collar 25, suitably located in a recess of the plate a. winding-upwheel n is fixed by means of suitable screws to the said collar 25 andis located in a recess made in the opposite face of the plate.

I claim as my invention- 1. In a stem winding and setting watch, thecombination with the watch-plate and a stem having a circumferentialgroove therein, of a rocking lever 'i, one end of which engages thegroove of said stem and a pivot-screw t having two conical portions andpassing through a diagonal opening in said' rocking lever and into thesaid plate whereby the said rocking lever may be caused to movelaterally and the end thereof made to engage or disengage the saidgroove in the stem by turning the said pivot-screw.

2. In a stem winding and setting watch, the combination with thewatch-plate, a stem, a rocking lever i and a pivot-screw 'i which whenturned is adapted to move the said le- The ver laterally, of ahand-setting pinion g, a winding-up pinion m, and means connected withsaid pinions and actuated by the movement of the said stem through thesaid rocking lever, whereby the said pinion m is thrown out of gear andthe said pinion g is thrown into gear with their respective wheels whenthe said stem is pulled, and vice versa when the stem is pushed in.

3. In a stem winding and setting watch, the combination with awatch-plate and a stem, of a rocking lever i, a pivot-screw having adouble-conical portion and passing through the rocking lever i andadapted to move the same laterally, a three-armed rocking bridge I)actuated by the movement of the lever i, a hand-setting pinion gthereon, a rocking disk Z, a winding-up pinion thereon, and a pincarried by said disk Z and adapted to be engaged by one arm of thebridge Z) whereby the stem may be actuated to throw the pinion m out ofgear and the pinion 9 into gear and vice versa, substantially as setforth.

4. In a stem winding and setting watch, the combination with awatch-plate and a stem, of a rocking lever i, a pivot-screw 1" having adouble-conical portion and passing through the rocking lever i andadapted to move the same laterally, athree-armed rocking bridge I)actuated by the movement of the lever 2', a hand-setting pinion gthereon, a rocking disk Z, a winding-up pinion thereon, and a pincarried by said disk Z and adapted to be engaged by one arm of thebridge 1) whereby the stem may be actuated to throw the pinion m out ofgear and the pinion 9 into gear by pulling out the stem, and means forreturning both the bridge I) and disk Z to their normal position whenthe stem is pushed in, substantially as set forth.

5. In a stem Windin g and setting watch, the combination with awatch-plate and a stem having a circumferential groove therein, of arocking lever 2', one end of which engagesthe said groove of the stem,means for connecting the said lever to the said plate whereby said levermay be moved to cause the end thereof to engage and disengage the saidgroove without detaching the said lever from the plate, a hand-settingpinion g, a winding-up pinion m, and means connected with said pinionsand actuated by the movement of the said stem through the said rockinglever whereby the said pinion m is thrown out of gear and the saidpinion g is thrown into gear with their respective wheels when the saidstem is pulled, and vice versa when the stem is pushed in.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

EDOUARD KOEIIN.

WVitn esses E. IMER-SOHNEIDER, En. KoEHN, Jr.

